Embroidering-machine.



- R. ZAHN, DECD.

A. mnzscn, ADMINISTRATOR.

EMBROIDERING MACHINE.

APPLICATION FILED JULY 9. 1912.

1 ,162,009. I Patented Nov. 30, 1915.

ATTORNEY pnirnn sra'rns :crim

orricn ROBERT ZAHN, 0F PLAUEN, GERMANY; ALFRED RIETZSCI-I ADMINISTRATOR SAID ZAI-IN, DECEASED.

. EMBROIDERING- MACI-IINE.

Application filed July 9, 1912.

1 '0 all whom it may concern:

Be it known that I, ROBERT ZAHN, a subject of the German Emperor, residing at Plauen, Vogtland, in the Kingdom of Saxony, Germany, have invented certain new and useful Improvements in Embroidering- Machines, of-which the following is a speci- T unevenness of the tension reaches the highest degree with fabrics of the enormously large embroidering machines as now in use. However, the unevenness of the tension, due to non-uniform stretching, in itself, after all would not be of very great importance and would not materially affect the embroidery, if at least this unevenness would remain constant during the entire embroidering process. Butthis is not the case. Leaving aside the fact that during lengthy periods of interruption of the work, as during dinner time and night time, owing to changes of air humidity and temperature, a distortion, often to a considerable extent, of the fabric, takes place, during the embroidering work, too, a distortion is caused, that is to say, different points of the embroidery are caused to change their position relative to the needles. And that the displacement of the fabric surface is not uniform at all parts, but is smaller here and larger there, to the left at one place and to the right at another, is due to the non-uniform tension of the fabric. It is evident, that, owing to -the above named circumstances, the embroidery design not only is greatly affected in its appearance, but also is frequently damaged and even rendered entirely useless. This particularly happens when distortion of the embroidery takes place at the time when the borers are set into operation. For then the sharp edges of the borers sever the adjoining already finished parts of the embroidery design. Moreover, the borers in themselves give rise to distortion of the fabric. When Specification of Letters Patent.

Patented Nov. 30, 1915.

Seria1 No. 708,496.

the borers, of which in some machines there are about a thousand, simultaneously pierce the fabric, their sharp edges cut the fibers of the fabric, and it is evident that owing to the elasticity of the fibers, the tension of the fibers of the entire fabric surface is immediately changed. But the embroidering process itself, too, particularly during the formation of so called fiat stitches, gives rise to distortion of the fabric, in that the design of the work is contracted and consequently the tension of the fabric increased. There is only that difference between the distortion caused during the embroidering process and the boring process, that during the latter the 1 fibers are severed and the tension of the fabric is lessened instead of increased as during the former. As the'lessened tension of the bored parts isnot regularly compensated by the increased tension of the parts formed by the flat stitches, another cause for a variance in tension of the entire fabric is created.

i The object of this invention is to provide means for preventing, as much as possible, the tensions arising during the embroidering process fromaffecting the embroidery design.

My invention consists in that the embroidering needles, which, as well known, are arranged in close vicinity of the borers, are caused, during the boring operation, to enter the fabric with their points only and not quite to their eyes and to be withdrawn simultaneously with the borers at the moment when the fabric frame is 'to be displaced for the formation of the next series of boreholes. Thus the fabric surface becomes so to say temporarily reinforced by the needles at all those points where the borers could damage the same. As the needle points engage not only the fabric but also the stitch holes of the rigiolstitch plates. it is clear, that even avery-strong lateral force could not bring about a displacement of any part of the embroidery. Hence, as long as the borers are in action the embroidery maintains its position owing to its reinforcement by the needle points.

To make my invention more clear the same is more or less diagrammatically illustrated in the accompanying drawing in which similar reference letters denote corresponding parts, and in which Figure 1 shows one form of construction; 7

Fig. 2 a detail thereof and Fig. 3 another form of construction.

Vith reference to Figs. 1 and 2 the fabric surface is denoted by reference letters wm. The embroidering needles are denoted by 3 and the borers by 7. The latter are operated in well known manner from suitable driving means (not shown) through the medium of a bell crank lever 6.

The bell crank lever 2 is connected by one arm to a rod 1 which carries at its free end an adjustable roller 9. lVith its other arm it is connected to the arm 4& pivoted to the needle bar 3. The roller 9 is adapted to bear on the circumference of a cam 10 fiXed on a driven shaft 12 and serving to impart the reciprocatory motion to the needles for embroidering.

When it is desired to have the needles 3 engage the fabric with their points only in order to reinforce the fabric during the boring operation, the roller 9 is displaced transversely to the rod 1 to bear on the circumference of another cam 11 so fiXed on the shaft 12 that a part of its circumference coincides with that of cam 10.

The displacement of the roller 9 is effected by meansof a forked bell crank lever 8 which constantly engages the roller 9 (Fig. 2) and which may be operated by hand or from the jacquard mechanism (not shown) through the medium of the rod Accordin to the modification shown in Fig. 3 the arm or lever 42, which is pivoted at one end to the needle bar 3, is at its opposite end provided with notches 4, P. The

bell crank lever 2 has one of its arms pivoted to the rod 1 and its other arm formed with a pin 2 for engagement with the notch 4. The rod 1 carries the roller 9 which bears on the circumference of the cam fixed on the driven shaft 12 and serving to impart reciprocatory motion to the needles 3 for embroidering. Fixed on the shaft 12 is another cam 13 on the circumference of which bears a roller 14: carried by a rod 15. The

opposite end of this rod 15 is connected to one arm of a three armed lever 16. Another arm of the latter is formed with a pin 16 adapted to be brought into engagement with the notch 46 of the arm 4 The third arm Copies of this patent may be obtained for of the lever 16 is connected through a rod 17 to a lever 18 which carries the fabric presser 19.

During the embroidering operation the arm at is coupled to the bell crank lever 2 and the cam 10 impar s motion to the needles. For the boring operation the arm l by means of the rod 5 ,'is lifted to be uncoupled from the lever 2 and coupledto lever 16, whereby the needles 3 become positively connected to the presser 19., which is operated from the cam 13.

lVhat I claim'and desire to secure by Letters Patent is:

1. In embroidering machines, the combination with the needle bar, of two coaxially arranged driven cams for reciprocating the latter and an adjustable member capable of cooperating with either one of said cams to impart movements of different length to the needle bar.

2. In embroidering machines, the combination with the needle bar, of two coaxially arranged driven cams for reciprocating the latter and a jacquard controlled adjustable member capable of cooperating with either one of said cams to impart movements of different length to the needle bar.-

3. In an embroidering machine,a needle bar, actuating means therefor, a fabric Presser and actuating means therefor and means intervening between said two first named means for positively connecting the said needle bar to said fabric presser actuating means during an operation other than the embroidering operation.

1. In embroidering machines, the combination with the needle bar and the fabric presser, of driven means for the operation of said needle bar, driven means for the operation of the fabric presser and means interposed between said two first named means and whereby the said needle bar can be uncoupled from its own driving means and coupled to that of the fabric presser.

In testimony whereof I afiiX my signature in presence of two witnesses.

- ROBERT ZAHN.

Witnesses:

A. CURTIS ROTH, ROBERT H. NIER.

five cents each, by addressing the Commissioner of Patents Washington, D. C. 

